JPS6057250B2 - Television receiver channel selection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a channel selection device for a television receiver.

While watching a program on a certain channel on a television receiver, there are times when the program is temporarily switched to a program on another specific channel, such as a baseball broadcast, and the user wants to know the progress of the program.

In this case, with conventional television receivers, it is necessary to switch to the desired channel each time and then return to the original channel.

In particular, in the case of a television receiver that changes channels sequentially in an up-down manner, if the channel you are currently watching and the channel you temporarily want to watch are not adjacent to each other, you will have to switch channels several times. This channel selection operation had become quite embarrassing.

The present invention has been made in view of these points, and it is an object of the present invention to provide a television receiver that is extremely convenient for users.

Furthermore, the present invention provides a channel selection device for a television receiver that can temporarily call and receive a desired channel by performing a simple operation while watching a program on a certain channel. .

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, where 1 is a tuning switch group consisting of N tuning switches, 2 is an encoder, 3 is a tuning channel memory, Now, by selectively turning on any one of the channel selection switches 11, 12, . The selected channel signal is derived, and is supplied to the selected channel memory 3 and stored therein. The channel selection information stored in the channel memory 3 is transmitted through the channel selection switches 11, 12,
Each time . That is, a remote control signal transmitter (not shown) emits or a remote control channel selection signal is received by the remote control signal receiver 4,
This is applied to the signal discrimination circuit 5, discriminated as an up or down signal, and supplied to the channel memory 3.
Therefore, in the channel memory 3, each time the up/down signal is supplied, the code contents are counted up or down one by one. The selected channel information obtained from the channel memory 3 is applied to a channel display decoder 6 and also via an AND gate group 7 to a channel selection decoder 8.

Therefore, at this time, one of the light emitting diodes 91, 92, . On the other hand, based on the output of the tuning decoder 8, a predetermined tuning voltage is derived from a specific variable resistor among the tuning voltage setting variable resistors 10, 102, . The signal is supplied to the tuned tuner 11, and as a result, a predetermined channel can be selected and received. Note that since a voltage of "H" is normally applied to one input terminal of each AND gate in the AND gate group 7 from the Q output terminal of a flip-flop 23, which will be described later, each AND gate group is normally open. The selected channel information in the channel memory 3 is supplied as is to the channel selection decoder 8 via the AND gate group 7, and the selected channel at this time is always in a receiving state.

However, now the preset channel call switch 12
When the flip-flop 23 is turned on and off, the operation of the flip-flop 23 is reversed, and at this time, the flip-flop 23 is turned on and off. The Q output of 23 becomes the "L" (zero voltage) level, while the Q output becomes the "H" level.As a result, each gate of the AND gate group 7 is closed, and conversely, each gate of the AND gate group 13 is opened. Therefore, at this time, the preset channel information previously stored in the preset channel memory 15 is supplied to the channel selection decoder 8 instead of the channel selection information in the channel selection memory 3, and the preset channel enters the receiving state. When the call switch 12 is turned on and off again, the operation of the flip-flop 12 is reversed again, and the Q output of the flip-flop 12 returns to the 6"W" level, while the Q output returns to the 4"L" level, which causes the AND gate group to 7 are opened again, while each gate of the AND gate group 13 is closed, and as a result, the channel selection information in the channel selection memory 3 is supplied to the channel selection decoder 8, and the original channel selection is restored. It will be received again.

In this way, by repeating the on/off operation of the calling switch 12, the selected channel and the preset channel are received alternately.

Here, a call switch similar to the call switch 12 is also provided on the remote control transmitter side, and in particular, when the switch is turned on, a call signal derived to the signal discrimination circuit 5 is supplied to the flip-flop 23 as shown by the broken line. By doing so, it is possible to easily call and receive preset channels by simply turning on and off the calling switch on the remote control transmitter side. Note that the preset channel memory 15 has a 4-bit memory element like the channel selection channel memory 3, and the memory operation of preset channel information to the preset channel memory 15 will be explained next.

First, in the same way as when operating a channel, turn on the channel selection switch corresponding to the desired channel in the channel selection switch group 1, store the channel information in the channel selection memory 3, and then store the channel information in the channel memory 3 in this state. When the switch 16 is turned on, the one-shot multivibrator 17 is driven by the negative pulse shown in FIG. A shot pulse is generated and applied to one input terminal of each gate of AND gate group 18, thereby opening each gate.

At this time, the one-shot pulse of opposite polarity obtained from the one-shot multivibrator 17 is applied to the delayed pulse generation circuit 19, and the delayed pulse shown in FIG. and is supplied to the preset channel memory 15. Therefore, this delayed pulse is stored in preset channel memory 1.
The channel information obtained from the channel memory 3 at the moment when it is added to the preset channel memory 15 is stored as it is in the preset channel memory 15. Once the channel information is stored in the preset channel memory 15, the channel information in the channel selection memory 3 will not be input unless the memory switch 16 is turned on again since each gate in the AND gate group 18 remains closed. At this time, the information stored in the preset channel memory 15 is stored and held as is as preset channel information. At this time, the preset channel information is constantly supplied to the preset channel display decoder 21, and based on this, the preset channel display light emitting diode 2
21, 222...22. One of the channels lights up, thereby displaying the preset channel. Note that here the preset channel display light emitting diode 221
, 222...22n, for example, use green light emitting diodes, while the light emitting diode 9 for displaying the selected channel
If red light emitting diodes are used for 1, 92, . . . 9n, it is possible to easily distinguish between the selected channel and the preset channel.

According to the channel selection device of the present invention, a preset channel memory that stores specific preset channel information is provided separately from the channel selection channel memory that stores information on the channel selected by the channel selection switch as described above, and in particular, a call switch When on/off operation, this preset channel can be called and received regardless of the selected channel.

Therefore, in a television receiver using the channel selection device of the present invention, if you want to occasionally watch a program on another channel while watching one program, you can preset this channel in advance and select it at the desired time. By simply turning the call switch on and off, the user can very easily call and receive the channel, and then return to the original program again, which is very convenient for the user.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the channel selection device of the present invention,
Figure 2 shows the signal waveforms of various parts in the same example. It is a diagram. 1...Tuition selection switch group, 3...Tuition selection channel memory, 7, 13...And gate group, 12...Call switch, 15...・・・・・・
Preset channel memory, 23... flip-flop.

Claims (1)

[Scope of Claims] 1. The coded channel selection information is read from the channel selection memory by the channel selection switch, and this is converted into a corresponding tuning voltage and supplied to the electronic tuning tuner, and the channel is selected and received. A channel selection device for a television receiver comprising: a call switch; a preset channel memory that stores single preset channel information encoded independently of the channel selection information; A flip-flop driven by an operation and two gate circuit groups for alternately deriving the coded channel selection channel information and preset channel information from the output of the flip-flop are provided, and when the call switch is turned on for the first time, A channel selection device for a television receiver characterized in that a preset channel is called and received by an off operation, and the original selected channel is received again by an on/off operation. 2. The channel selection device for a television receiver according to claim 1, wherein the call switch is provided on the side of a remote control signal transmitter, and a preset channel can be called and received by remote control operation.